SOLUTION: I have math homework and the question says : work out which of these functions are quadratic and whether it is U shaped or the n shaped. eg: y= x squared + 7u ... how do i work thi

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Question 283445: I have math homework and the question says : work out which of these functions are quadratic and whether it is U shaped or the n shaped. eg: y= x squared + 7u ... how do i work this out??
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
let's say it is y=x^2+2x+1 then it opens up and is u shaped
if it is y=-x^2+2x-1 then it opens down and is n shaped
if the number before the x^2 is positive or has no sign then it is u shaped and opens up
if the number before x^2 is negative then it is n shaped and opens down